gf4231p2003a

Electromechanical brake booster, basic function

Vrsta gf · tema 42.31 · verzija 0100 · 2020-07-23

Vrijedi za: Model all (CAR) with code ME10 (Hybrid vehicle)

Nije dostupno na jeziku „hr”; prikazano na jeziku Engleski.

Smještaj

Funkcijska skupina 2 Donji postroj › 42 Kočnice - hidraulika i mehanika › 42.31 Brake Assist (BAS) — Serija 900 (modeli 9**) · Serija 902 (modeli 9**) · Serija 904 (modeli 918, 919, 924, 925, 938, 943, 957) · Serija 906 (modeli 917, 918, 924, 953)

Vrijedi i za motore/mjenjače: 139 ***, 254 ***, 256 ***, 272 ***, 276 ***, 282 ***, 457 9**, 541 9**, 542 9**, 608 ***, 700 4**, 700 420, 700 421, 700 422, 700 423, 715 3**, 715 5**, 722 6**, 722 9**, 724 ***, 724 0**, 724 033, 724 044, 724 045, 724 1**, 724 103, 724 114, 724 115, 724 120, 725 ***, 725 0**, 725 035, 725 037, 725 038, 725 085, 725 1**, 739 390, 739 391, 739 395, 739 396, 739 397, 739 398, 739 399, 740 698, 743 3**, 743 4**, 743 498, 746 971, 924 9**, 924 910, 925 9**, 926 9**

GF42.31-P-2003A

Electromechanical brake booster, basic function

08.07.2020

Model

all (CAR)

with code ME10 (Hybrid vehicle)

Electromechanical brake booster, basic function

P42.31-A000-79

Example illustration

1

Electromechanical brake booster

Overview

This document contains information on:

General

Function requirements

Function

General

The electromechanical brake booster boosts the brake force applied by the driver. If the driver presses the brake pedal, the brake force is supported by an electric motor. In autonomous operation, the electromechanical brake booster can also brake independently. Without electrical assistance, the brake operates only hydraulically and is not supported.

Function requirements

Engine in operation

Electromechanical brake booster, basic function

P42.47-A001-79

Electromagnetic brake booster

2

LiPS (diaphragm travel sensor)

6

Secondary piston

3

Spindle

7

Guide plunger

4

Transmission

c

Brake fluid

5

Electric motor

Function

Normal function

The driver initiates a brake request by depressing the brake pedal. The brake pedal moves the piston of the brake booster. The LiPS (2) (diaphragm travel sensor) detects the difference between the distances (a) and (b). The control unit is regulated so that the distance between (a) and (b) remains the same. The control unit actuates the electric motor(5), which moves the spindle(3) via the transmission(4). The spindle (3) is moved until the distance between (a) and (b) is the same again. If the brake pedal is no longer operated, the spindle(3) is moved in the opposite direction and the brake pressure is reduced.

Autonomous function

Brake applications in autonomous driving mode are forwarded electronically to the control unit. The control system forwards the signal to the electric motor(5), which moves the spindle(3) via the transmission(4). The spindle(3) is moved until the desired brake pressure is reached. On autonomous brake applications, the gap (b) is closed. If the spindle (3) is moved further when the gap (b) is already closed, the brake pedal is also moved.

De-energized operation

Without current, the electric motor(5) is unable to provide support. If the brake pedal is depressed, this moves the piston and therefore the master cylinder. The piston moves freely into the longitudinal grooves within the spindle.